School of Environment Science and Resources, Shanxi University, Taiyuan, Shanxi, 030006, China.
Institute of Resources and Environment Engineering, Shanxi University, Taiyuan, Shanxi, 030006, China.
Environ Sci Pollut Res Int. 2017 Oct;24(28):22301-22311. doi: 10.1007/s11356-017-9917-1. Epub 2017 Aug 11.
This paper presents a new soil amendment used for immobilization of soil Pb, produced from vinegar residue, stainless steel slag, and weathered coal. The pH value measuring, granulation and adsorption experiments were carried out to determine the optimal composition of soil amendment. Optimizing soil amendment B2 was composed of vinegar residue, weathered coal (humic acid 61.53 wt%), and stainless steel slag with the ratio of 80∶16∶4, and particle size was in the range of 2-4 mm. In the leaching column experiment, B2 addition reduced the Pb release from the soil as well as increasing leachate pH and decreasing the bioavailable Pb concentration. The leachate Pb concentration decreased with lengthened leaching time under lower pH, but such a phenomenon disappeared in the rebounding period. Compared to control, the DTPA extractable Pb content in soil decreased by 12.41, 13.20, and 8.78% with the B2 addition amount of 1.00, 2.00, and 2.00 wt%, respectively. In addition, the total Pb content of each soil layer generally rose as B2 addition increased. It was concluded that application of B2 led to lower transport and transformation of Pb in soil. Based on the single chemical extraction, the environmental risk of Pb was decreased after application of B2. Meanwhile, soil amendment was also a new way to recycle vinegar residue, stainless steel slag, and weathered coal.
本文提出了一种利用醋渣、不锈钢渣和风化煤制备的新型土壤改良剂，用于固定土壤中的 Pb。通过测量 pH 值、造粒和吸附实验，确定了土壤改良剂的最佳组成。优化后的土壤改良剂 B2 由醋渣、风化煤（腐植酸 61.53wt%）和不锈钢渣组成，比例为 80∶16∶4，粒径在 2-4mm 范围内。在淋溶柱实验中，B2 的添加降低了土壤中 Pb 的释放，并提高了淋出液的 pH 值，降低了生物有效态 Pb 的浓度。在较低 pH 值下，随着淋溶时间的延长，淋出液中的 Pb 浓度降低，但在回弹期，这种现象消失。与对照相比，B2 添加量为 1.00、2.00 和 2.00wt%时，土壤中 DTPA 可提取 Pb 含量分别降低了 12.41%、13.20%和 8.78%。此外，随着 B2 添加量的增加，各土层的总 Pb 含量普遍升高。这表明 B2 的应用降低了 Pb 在土壤中的迁移和转化。基于单一化学提取，B2 的应用降低了 Pb 的环境风险。同时，土壤改良剂也是利用醋渣、不锈钢渣和风化煤的新途径。
